Today KOrganizer's theming interface, CalendarDecoration, is not widely used. Plugins using the interface have to be written in C++, and the functionality remains simple.

My goals during Summer of Code would be:
- to allow for more features (background images, image/quote of the week/month, etc),
- to write some example plugins (national calendars, "This day in history" links, ...),
- to make it easier to write simple decorations for KOrganizer using a portable and easy-to-use format, which may be extended in the future (like the KDE themes).